# Valeri Aronov

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**Content Feed**

Question

Matrix-vector operations without loops

How do I do this without loops: HessW = rand(length(x), length(x), length(f)); GradW = rand(length(x), length(f)); A = zeros(...

4 days ago | 2 answers | 0

### 2

answersreshape() error in the function created by matlabFunction()

The error is known to MATLAB and will be fixed in the future

1 month ago | 0

| accepted

What is missing from MATLAB #2 - the next decade edition

Your TypicalX option for fminunc() (and others?) should be extended beyond usage for gradient evaluation only. I have used norm...

2 months ago | 0

Question

Rewriting code without loops

I have the following sizes of arrays of doubles: dev 101x1 GradW 4x101 HessW 4x4x101 The...

2 months ago | 1 answer | 0

### 1

answerQuestion

How to rewrite my code without loops?

How to rewrite this code without loops: Grad = zeros(size(x)); for i=1:length(x) for j=1:l...

2 months ago | 1 answer | 0

### 1

answerQuestion

reshape() error in the function created by matlabFunction()

matlabFunction() has generated for me AmplAndDers() to be used in fminunc(). The very first objective function evaluation fails...

2 months ago | 2 answers | 0

### 2

answersQuestion

Unrecognized function or variable 'datachk'?

Soryy for the long Description. I have prepared a target function for optimization and am using it to build contours for now. He...

2 months ago | 1 answer | 0

### 1

answerQuestion

Populating 2D meshgrid of a function of four variables

I have a function: function [y, Grad, Hess] = Target(x) ... end; where x's size is 4 (a vector of 4 variables)....

2 months ago | 1 answer | 0

### 1

answerQuestion

Replacing function variables with a vector before taking a gradient

I have a symbolic function: A = 1/((C1*C2*R1*R2*w^2 - 1)^2 + w^2*(C2*R1 + C2*R2)^2)^(1/2) I would like to replace C1, C2, R1, ...

3 months ago | 1 answer | 0

### 1

answerQuestion

Can I substitute a particular expression?

subexpr() discovers a common subexpression and rewrites a symbolic expression in terms of the found subexpression. How can I sim...

3 months ago | 1 answer | 0

### 1

answerQuestion

How to rewrite my expression using two abbreviations?

I tried Rewrite Expression Using Abbreviations example in https://au.mathworks.com/help/symbolic/subexpr.html for subexpr() and...

4 months ago | 1 answer | 0

### 1

answerQuestion

How to get rid of sign() in diff() results?

I have a symbolic function. diff() produces the result with sign(). The next derivative has dirac() in it. Is there a way to g...

4 months ago | 2 answers | 0

### 2

answersQuestion

Using Hessian for least squares problem

It looks like lsqnonlin() from MatLab can't make use of a Hessian (it is not stated explicitly by MatLab, but I read this in the...

5 months ago | 1 answer | 0

### 1

answerQuestion

How do I plot a symbolic function of one variable for a specific set of argument values?

Say, I have a symbolic function y(x). There is no support for plotting it when x=logspace(1, 5, 101) in fplot(). How do I do it ...

5 months ago | 1 answer | 0

### 1

answerQuestion

Where is surf() result?

Can't see the plot even in the documentation example: [X,Y] = meshgrid(-2:.2:2); Z = X .* exp(...

7 months ago | 0 answers | 0

### 0

answersQuestion

confusing error message: 'Not enough input arguments'?

Having: function [f] = Simple(x) f = (x(1)-1).^2 + (x(2)-1).^2; end and running: x = lsqnonlin(Simple, [2.0, 2.0]) I am g...

8 months ago | 1 answer | 0